
1) Nautical terminology
Found on
https://www.crosswordclues.com/clue/plankowner

A plankowner (also referred to a plank owner and sometimes a plank holder) is an individual who was a member of the crew of a United States Navy ship or United States Coast Guard cutter when that ship was placed in commission. Originally, this term applied only to crew members that were present at the ship`s first commissioning. Today, however, p....
Found on
http://en.wikipedia.org/wiki/Plankowner
No exact match found.